i really need help asap it is a test

How will the circumference of the circle change if it is dilated by a scale factor of 4?  


The circumference will be 4 times greater than the original.
The circumference will be 16 times greater than the original.
The circumference will be 1/4 the original.
The circumference will be1/16 the original.

i really need help asap it is a test How will the circumference of the circle change if it is dilated by a scale factor of 4 The circumference will be 4 times g class=